Live Webinar Series
INTRODUCTION TO STEEL BRIDGE DESIGN
AISC and NSBA are pleased to offer a webinar series on steel bridge design. Written and presented by a group of experts in the steel bridge industry, this webinar series not only suits those new to steel bridge design, but it also serves as a good refresher for experienced bridge designers.
There are two registration options for this webinar series.
Individual Live Webinars
Four live webinars, beginning on October 12, will explore topics such as the fabrication process of steel plate and box girders, plate girder design, the effects of curvature and skew, and fatigue and fracture design. Register for each live webinar individually. Registration is valid for one site connection (one computer) where an unlimited number of people can watch the webinar and receive a PDH certificate.
For those who are new to bridge design or would like a refresher, AISC is offering the option to register for a complete introduction to bridge design course. Before watching the live webinars starting on October 12, participants can catch up on topics such as basic bridge terminology, the AASHTO LRFD Bridge Design Specifications, steel material properties, and loads and analysis by watching four recorded webinars. Participants may earn PDH credit for each session attended and a certificate of completion (EEU) for this 8-session course. This is a great opportunity especially for students and recent graduates starting a career in bridge design. Only the registrant will receive a PDH certificate for the 8-session package registration option.
Note: This course is an encore presentation of the 2016 course Night School B1: Introduction to Steel Bridge Design.
This session will be a general introduction to bridge engineering with the goal to prepare students for the 8-part course. The session will include a review of basic bridge nomenclature and the various steel bridge superstructure types, bearings, and supporting substructure types. In addition, a brief tutorial on how to read bridge plans will be provided. This will be followed by a detailed look into the various types of framing plans typically used for steel I-girder bridges and a cursory discussion of analysis methods. The session will identify the two major bridge design specifications, AASHTO LRFD Bridge Design Specifications and the AREMA Manual for Railway Engineering.
This lecture will introduce the participants to the AASHTO LRFD Bridge Design Specifications (BDS). The session will present a historical background on the evolution of the AASHTO BDS from earlier Allowable Stress Design (ASD) and Load Factor Design (LFD) design methodologies up to the present-day Load and Resistance Factor Design (LRFD) design methodology. The major improvements to the specifications at each step will be highlighted, along with the processes and procedures that are employed to update and maintain the specifications. A broad overview of the LRFD BDS will be provided along with an overview of Section 6 of the BDS on steel structures. The various limit states and the associated behaviors of concern at each limit state for different types of members used in steel bridges will be also discussed. Important design issues related to skewed and curved steel bridges will be briefly highlighted.
This session will provide an introduction to steel production and metallurgy followed by an explanation of the special requirements in A709, the material specification for bridge steel. The basis for fracture toughness specifications and special requirements for steel for use in fracture critical member are presented. The attributes of high performance steels (HPS), weathering steels and stainless steel are introduced. The new bolt specification for high strength bolts, F3125, is presented along with the basis for the rotational capacity provisions required for bolts in bridges. The recommended specification for anchor rods and bolts are presented including potential problems associated with very high strength rods in highway applications.
The load models, consisting of magnitude, configuration and application of loads, are unique to the AASHTO LRFD Bridge Design Specifications. This session begins with an explanation of these load models, particularly the HL-93 live load model, along with their development. The live load analysis methods, categorized as approximate and refined methods, are presented. Modern load distribution factors are discussed and compared with the traditional distribution factors of the AASHTO Standard Specifications for Highway Bridges. The majority of highway bridges in our nation’s inventory are designed to these specifications. Finally, the guidelines for refined analysis including the finite element method (FEM) are reviewed.
This session will address the fabrication process of steel plate and box girders. All steps will be presented, from cutting the plates to size and fitting and welding the plates together to form the girders, to the fitting of the field splice connections. The impact of design on fabrication costs will be discussed, and recommendations will be made on design features from a fabrication standpoint. The welding processes used to join the plates including submerged arc weld, flux cored electrode, and narrow gap electroslag welding will be described. The inspection techniques and requirements used to ensure the quality of the welds will be presented. The session will conclude with a glimpse into the future of fabrication showing the virtual assembly process.
This session will focus on the design and behavior of plate girders in steel bridges. Methods of preliminary sizing of the girders will be discussed along with an overview of the strength evaluation of composite girders. The AASHTO strength provisions for the evaluation of member and system stability will be covered. Member and system stability topics will include the evaluation of local buckling, lateral torsional buckling, as well as system buckling of narrow steel bridge systems. The principles will be supported through design examples.
This session will address the behavior, analysis, and construction of curved and skewed steel I-girder bridges. The session will begin with a discussion of how steel I-girders and their connecting cross-frames fit together during erection, which will establish the framework for the class. Then the behavior of curved and skewed steel I-girder bridges will be reviewed, with an emphasis on behaviors unique to these types of structures (torsional stresses and deformations, global overturning, etc.). Various analysis methods for curved and skewed steel I-girder bridges will be described and compared, including 1D, 2D, and 3D analysis methods. The effects of boundary conditions, span length, curvature, and skew will also be presented. The session will then transition to a discussion of the fabrication and erection processes associated with fit, including fabrication detailing, girder and cross frame fabrication, and girder and cross frame erection practices
This session will provide an introduction to fatigue and fracture concepts as applicable to steel bridges. The nominal stress approach to fatigue design and evaluation, as used in the AASHTO LRFD, will be presented with illustrative examples. A review of how fatigue has been treated in previous versions of the AASHTO Specifications will also be provided. The session will also include a basic introduction to fracture mechanics along with some simple numerical examples. The objectives of the AASHTO/AWS fracture control plan will be presented, and guidance on identifying a member as a Fracture Critical Member (FCM) will be provided. The session will also cover basic fatigue repair and retrofit concepts.
|Individual Live Sessions||
Prices are per webinar. Registration includes certificates for an unlimited number of people at one connection site.
Prices include all 8 webinars. Registration includes a certificate for the registrant only.
|Individual Live Sessions||1.5 PDHs per webinar (up to 6 PDHs) to unlimited attendees at each connection|
|8-Session Package||Up to 12 PDHs (1.5 PDHs per attended session) to the registrant only|
Certificate of Completion
Individual Live Sessions
|1 EEU (Equivalent Education Unit), AISC's certificate of completion, for the registrant only. Eight session registrants who attend all sessions (live or recorded) and pass 7 of 8 quizzes and the final exam will be awarded 1.0 EEU. Earning an EEU is worth a maximum of 12 PDHs.|
|Individual Live Sessions||Live only
|8-Session Package||Watch recorded sessions R1-R4 and pass a quiz for credit. Watch sessions L1-L4 live or watch"make up" (recorded) sessions available online for three weeks after air date. Credit for recorded sessions is given only when quiz is passed.|
Quiz + Recording Access
|Individual Live Sessions||Not available
|8-Session Package||Sessions R1-R4 quiz and recording access available starting September 11. Sessions L1-L4 available online for three weeks after air date. Access to quiz and recording available through MyAISC account.|
- Date: Live Webinars at 1:30 p.m. EDT on 10/12/2017, 10/19/2017, 10/26/2017, 11/02/2017 (Recorded sessions R1-R4 available starting 09/11/2017)
- Duration: 1.5 hours per session
- PDH Credits: 1.5 per session
- Registration Deadline: 10/26/2017 11:00 a.m.
- Substitutions and Cancellations: Substitutions can be made at any time. Eight-Session Package registration cancellations received 1-3 days prior to Session L1 will be charged a $150 service charge. Cancellations and no-shows the day of Session L1 and later will not receive a refund. Individual session registration cancellations received 1-3 days prior to the webinar will be charged a $50 service charge. Cancellations and no shows the day of the webinar session will not receive a refund.
Karl Frank is a consultant in Austin, Texas.
Dr. Helwig is a professor at the University of Texas at Austin.
Ronnie Medlock is Vice President of Technical Services at High Steel Structures, LLC in Lancaster, Pennsylvania.
Domenic Coletti is a Senior Bridge Engineer with Michael Baker International in Cary, North Carolina.
Robert Connor is a Professor in the School of Civil Engineering at Purdue University.
Anna Teague, PE, Joanne Shaner, PE, Michael Grubb, PE, and John Kulicki, PhD, PE